Can not access my DVDs any more... What can I do?

Any error messages ?
The more information you give the better able to assist with your issue we are.

Nothing happened at all... The PC stay thinking for very long time and not responding with no error messages. I tried it on a different types of drivers (Sony, Dell and HP) with no progress. One time it is open but could not see any data their..!

So is this one DVD or a whole bunch of them ?

Are they originals or burned discs?